CVE-2021-39609: Flatcore Flatcore-CMS

Medium severity, CVSS 5.4. EPSS: 1.7% chance of exploitation in the next 30 days.

Cross Site Scripting (XSS) vulnerability exiss in FlatCore-CMS 2.0.7 via the upload image function.

Affected products

• Flatcore Flatcore-CMS: version 2.0.7 only

Published 2021-08-23. Last modified 2026-06-17.